.page{
    
    height: 600px;
    background-image: url(img/back.jpg);
    background-repeat: no-repeat;
    background-position: center 0;
    position: relative;
    
}
body {
    margin: 0;
}
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    
}
.a {
    width: 45px;
    height: 35px;
    margin-top: 10px;
    margin-left: 22px;
    
}
.nb {
    display: none;
}

.toggle,
.toggle::before,
.toggle::after {
    display:inline-block;
    height: 2px;
    width: 20px;
    background:#fff;
}
.toggle {
    position: relative;
    background-clip: content-box;
    padding: 8px;
    
}
.toggle::before,
.toggle::after {
    content: '';
    position: absolute;
}

.toggle::after {
    bottom: 0;
}
.toggle::before {
    top: 0;
}

.font {
    font-size: 30px;
    height: 33px;
    color: #fff;
    text-align: center;
    justify-content: center;
    margin-top: 24px;
}
.font2 {
    font-size: 17px;
    width: 230px;
    color: #fff;
    text-align: center;
    margin-top: 95px;
    margin-right:auto;
    margin-left: auto;
}
.an {
    display: flex;
    margin-top: 37px;
    width: 233px;
    height: 57px;
    background: rgb(68,130,236) url(img/android.png) no-repeat 28px center;
    flex-direction: column;
    margin-left: auto;
    margin-right: auto;
    align-items: center;
    border-radius: 7px;
    
}
.font3 {
    color: #fff;
    font-size: 12px;
    margin-top: 8px;
}

.font4 {
    color: #fff;
    font-size: 20px;
}
.phone {
    display: block;
    width: 178px;
    height: 357px;
    margin-top: 34px;
    margin-right: auto;
    margin-left: auto;
}

.intro{
    display: flex;
    flex-direction: column;
}
@media (min-width: 1000px) {
    .toggle {
        display: none;
    }
    .page {
        height: 720px;
        display:flex;
        justify-content: center;
    }
    .intro {
        flex-direction: row;
        display: flex;
        margin-left: auto;
        margin-right: auto;
        
        

    }
    .font {
        margin-top: 168px;
        margin-right: 80px;
        width: 747px;
        height: 116px;
        font-size: 48px;
        line-height: 58px;
        text-align: left;
        
        
    }
    .font2 {
        display: flex;
        width: 700px;
        height: 27px;
        font-size: 24px;
        margin-top: 15px;
        margin-right: 130px;
    }
    .phone {
        width: 348px;
        height: 697px;
        margin-top: 38px;
        margin-left:12px;
    }
    .an {
        width: 292px;
        height: 72px;
        margin-top: 94px;
        margin-left: 8px;
        border-radius: 8px;
        display: flex;
        background:rgb(68,130,236) url(img/android.png) no-repeat 41px center;
        justify-content: center;
        align-items: center;
        flex-direction: column;
        
    }
    .a {
        width: 78px;
        height: 78px;
        margin-top: 25px;
        
    }
    .font3 {
        color: #fff;
        font-size: 16px;
        line-height: 19px;
    }
    .font4 {
        color: #fff;
        font-size: 28px;
        line-height: 33px;
    }
    .nb {
        display: block;
        color: #fff;
        font-family: arial;
        font-size: 16px;
        
    }

    .nb-link {
        color: #fff;
        padding-left: 22px;
        padding-right: 22px;
        
        
    }
    .earth {
        background: url(img/earth.png) no-repeat  center / 14px;
        padding-left: 90px;
        
        
    }
    .earth::after {
        content: "";
        display: inline-block;
        width: 0;
        height: 0;
        border: 3px solid transparent;
        border-top-color: #fff;
        margin-left: 7px;
        

    }










}